Tannaka duality and convolution for duoidal categories

Details Tannaka duality and convolution for duoidal categories Tannaka duality and convolution for duoidal categories

2011-11-24

arxiv.org/abs/1111.5659v1

Mathematics

Category Theory

Scientific paper

Given a horizontal monoid M in a duoidal category F, we examine the relationship between bimonoid structures on M and monoidal structures on the category of right M-modules which lift the vertical monoidal structure of F. We obtain our result using a variant of the Tannaka adjunction. The approach taken utilizes hom-enriched categories rather than categories on which a monoidal category acts ("actegories"). The requirement of enrichment in F itself demands the existence of some internal homs, leading to the consideration of convolution for duoidal categories. Proving that certain hom-functors are monoidal, and so take monoids to monoids, unifies classical convolution in algebra and Day convolution for categories. Hopf bimonoids are defined leading to a lifting of closed structures. Warped monoidal structures permit the construction of new duoidal categories.

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